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28 March 2024 |
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Article overview
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Real-space BCS-BEC crossover in FeSe monolayer | Haicheng Lin
; Wantong Huang
; Gautam Rai
; Yuguo Yin
; Lianyi He
; Qi-Kun Xue
; Stephan Haas
; Stefan Kettemann
; Xi Chen
; Shuai-Hua Ji
; | Date: |
2 Sep 2022 | Abstract: | The quantum many body states in the BCS-BEC crossover regime are of
long-lasting interest. Here we report direct spectroscopic evidence of BCS-BEC
crossover in real-space in a FeSe monolayer thin film by using spatially
resolved scanning tunneling spectra. The crossover is driven by the shift of
band structure relative to the Fermi level. The theoretical calculation based
on a two-band model qualitatively reproduces the measured spectra in the whole
crossover range. In addition, the Zeeman splitting of the quasi-particle states
is found to be consistent with the characteristics of a condensate. Our work
paves the way to study the exotic states of BCS-BEC crossover in a
two-dimensional crystalline material at the atomic scale. | Source: | arXiv, 2209.00758 | Services: | Forum | Review | PDF | Favorites |
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